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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7953929789c1d9abcfd1014431d079bb24142be55192964bd0beca27c54d01e5' 
  AND token = 'VhbQCO+xwjlxr2HhZSyVhHGjj2maQhRQw79xC9vNxcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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