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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba64286d76039af89fd01b6c52e9360b6953ecc21c5d6374cf864c2778efea68' 
  AND token = 'B3HYricgiZ72wVAbjrp/fwqkokoN/6Ercak60EhTm2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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