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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24047079cb9d2acf2a2309567aa9cf2fa2ca0e6bef74d3a122d538e5b7a0d59' 
  AND token = 'T/qFWDGxKH5Qxm6EbMiemXTl2q6E+HgABKO7ZpLXn4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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