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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15091ec536c67086f07d7f8e0b026f7f8121496179ab7979da358ebf40e0501d' 
  AND token = 'BTbdXks3yqUMaQH6G+fcrkQbsa+F+fJGv5b1L51bmkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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