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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4988b84cb17eddb410c0efa17e5527441f8ebf2c20cac94b70dc658d6e10f795' 
  AND token = 'm4r7KD4lEWxiyPqpa7gG2N08/Xdj5RuRojkJ3prfAv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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