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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c7f5634622c535be409927abd82c14ae53f16ff6c260b5ae71edb2eee9b730' 
  AND token = '0sdqhZg0ho/GGPRyPSbpRwjgehArynATiIifReo8/kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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