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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c0a6ba7679ad181d188348fcdf40898c1c15f1027750c0a16120a1bd64445b' 
  AND token = 'gAiEuRtHTkzAA7YA2gQDl5jlRYLWPeezdjsYpaaUH4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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