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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf8ad588da0a1d71df08fe5cc766e7dd156df08003cffb659271d8e61bff6f8' 
  AND token = 'IIMHbCAv+dtmmzOdgyfmQiBycm199vdqY6VcMZdQA84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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