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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b183ed56e13256638eddb4c74cd6e2a28950ee8b3043e1b359aefe335e29cd' 
  AND token = '6Vuzd8fFOJ7hgmO/K3JNeqRdRgwLOoDc97/4W2hfIDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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