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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c032a2bc1ba7fa13a1824acf20db1a579dca8325bbbebef02edd3f9999e1ef6' 
  AND token = 'AhRk6z5d45v1dlN4f27AD9Zt1tFCt4kHFPFaW0AIkwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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