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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4acf5ce5c12883c39c1c448703ffef14e7638bb047206ce3a0096279ba017ba' 
  AND token = '55rEtKz02F42gM2sCFhC5ODKjxv/MoLqspWvDS+yST4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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