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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e1be187ec4485efe4ac25d0667aa92b4da098d7694c11caae4a85afb1e47ed' 
  AND token = '/VXikZ75r4LaH4a3SuIV9GmMnBooVxGOZtGu0VltSf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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