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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c510baa62e17e703e34150148bf9b8bd6cdbb74b01e0367a15e3b2c99df276b' 
  AND token = 'z80glScT/MDd9+jSsn4CnnjQs/OdYKopX9q1HLy9iis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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