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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82da6090912e301238982b49582f83437b48015b27e9970929c11cfbf6e4ab8c' 
  AND token = '8xKP4flofD591/pyH5dGNV8LZyKUakUXnwbMU3NLpP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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