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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2baec4cd8ad0e2c33897556fa583901aa977bbc524a8380bff2ce7bea33c6f6b' 
  AND token = 'ImDlKBpKEikScXOK9FNNU0qhR0N/SSBe6tMF3I8OjNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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