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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de731dc9bc043c5d9b5c4bf911af88a06d201ab3b2faade6d73378a4058fd36e' 
  AND token = 'felDbQZQFinKKeNnm3vrk+ps52q13qzRL6ewzzXFQGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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