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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb7345fa4df1a2654ac0d1398a3c6501db6e3f01893f9a54fe5f17c140bc0a9' 
  AND token = 'AsunLOJckuI5eo+A2NWaaTe7gWUodS1byzkUPWhY9iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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