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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8da55b08348d5532622af339806c003ab31242639013e33155dc9dcb922623b' 
  AND token = 'qYqTdHiPten46HhXr4ACUqkKsEqvBZD3VsqMu/cLrr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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