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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9404de2a154b5c693ca2f127de13b358a068a5d2cee578007f56c0e9dea0dfc9' 
  AND token = 'u3KnUxDeSmws/gb8Qk1rcdhpK/+M0o3q7JMeRFQseSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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