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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b9dd5c516ce00134a4a07a03cb30d80391d3f4b6296957670a1c4bf3608c52' 
  AND token = 'vxfZ0s8Sn4DNDarLsECGvVMlbNKEgmwABj23sXzsjjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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