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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2d858b920e43d8f55c9f409e2eec31e80c6123ea411d61dd1063ec21313ba9' 
  AND token = '+g/tHIkofCc2HNb3Tne5os0RvTqJTG9/rulp91AOG6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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