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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4552c841d8cded7265d10754af8ffcbaed9628b7e84102e5a52ab4b87b808386' 
  AND token = 'udpD9l0trFfyZ4LQ1Gd0AL0PJcTqpJ+FuDKqL4KHGmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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