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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2564b0e49f3a90f596e855cdccadcb00178a63d76b348c3fa4090feb5c7620' 
  AND token = '6ceiDf2mv4zlerml9Zm1KIXf+hz3o8jt2rYUBmrqyos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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