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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1b7a44006241e1485c2673d22135e28f2ef20a005bed387d00d3ab01c1c486' 
  AND token = 'dtDJrkoVJ2dkl9VvENMl1SD263DOvj1XJ952xpKamTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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