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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25014b284328006caf187df41d1f0d30f2cee9264d882c14f5114db1e78c665a' 
  AND token = '7cl1wel0m3SVoBOPqVqZAD91/evoUj+UodD1oHHeiZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}