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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebac00aa62121e903dca80ecec1c0c7939866d4cbc6fd8780a02b0c661a41b6' 
  AND token = 'lbpq3+pGXSa1SErncpqC/xAc52PwAqFkyeM+7A+gya4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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