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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6aae712a4b8d24f001fe0dd6116d5c0206bf8d60f27d8326221a491d7efe9e6' 
  AND token = 'DDItyXPiZ5rMkwuWtD/b8scamy1z2gAengSH02tfUqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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