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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa5e40f9d352846664071e00e713f25b3f3efeeecc5a5d9f4128a2f558745da' 
  AND token = 'uVzeSIWDVbKI4JG6nodWbtb9229gTo7+C/1NcJrNomc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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