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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194565a2ec398118a00719b9236740edc5029650150189a6da6d29b2c06d02d0' 
  AND token = '4h5um2u/RiHwHPOHXh9whS0sRDDHsps1Px+k6M8CEDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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