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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36b6136282359d55f1b0f22daff2015e399c78485f1a16ae4e295df189735ff' 
  AND token = 'jROBk5RhqN89bWOPeF5iuzM84v2pVJRLRisPfruIn8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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