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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35e727cbee9fea2a71dbde5aba8aad3632e8aa35f0cdd84c19f268e2360a832' 
  AND token = '6QL702XSbtagcCaYK9RWdo/Eielj14LeomnjafYBH4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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