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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff031b6814da449b9b155a0b4442328243d65df7a078641f3274afb34260221a' 
  AND token = '7loLtNm2WliYf8SWT5S0g5GUviAwLeydPQUhLq2tVdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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