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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c6b32217fb837a00a2fa9473d8b7a6c598f9a73b5ac3afcd13bb8f6e7b0f76' 
  AND token = 'kEcu16rYmGmP9GiT8/i5HRhGch1XNyYSxI1MTUCjz6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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