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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c8c3244ef678f6708558ac31d0f24990499e7e1c9edb23077ae43f51959c32' 
  AND token = 'bDSZd5OnP8rqWc+AC/ll/QhqnaVkTSUA/V8QujxkwVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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