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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d6cf8fc16d3df60b9e7d0fd04cdf0314d8b518683ac0a5f91698660b7f815ba' 
  AND token = 'EadIMq5KF5M1YfoGTW1eMF7Rzy/wig2vpO326CYecY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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