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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068a0d4ed4f3761f878d37c842214043065b056aa8ef58500c12b5f1d3c999e1' 
  AND token = 'e1eQuV4YWASR3Mf7JDxb6ZIA3v7kl/OCi+QKI902BNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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