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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2b0854c299949951321b628a940dc10bebee919b3adbc628f3b206bc9e18fb' 
  AND token = '+m16QuJxwkN2uPT6w+HzxvSjfhzHHBEzYs45AgdCRYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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