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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15703c76ded3b69718c10dcfa878c4ba075f092e3f4cb2700d61ca8514ee9291' 
  AND token = '5Hr1vZcKcZAM8M/EPaWu5wgGm1AyJTaGAM3VfrqYRiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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