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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba62b47272843df4fe950e1add4da7cfa11d7da297285ef97a5c9c158f9de76' 
  AND token = 'RgfkPwSah9qzyst1tXjtF4i3j4kytpHOZ2oRKRdXp3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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