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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2faf85fcebc1003dc1f8c732be48d8588c1c9e1b7cae67066cee40c2f545ab' 
  AND token = '6OlDyQSQki1f6Z2CMvZZ4PuM4BJHLKb1qYvE4czI9Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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