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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0edc401411cf190ccc3089319ad005c6bacbd90f9f7bc72498fa5d6d2bec4ce' 
  AND token = 'z6SC3MgCVyvYfkIIaXA8/drwM7o9Q+3JN87/AWCobLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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