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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbc07ce3f380424daf080b87e1ab221df8fca652d28cf2e80057eab14eab4d2' 
  AND token = 'x4k5H0r7djnHzh/mdhHbT1pTMtfKodcmW2wdiDa1vGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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