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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8974e22627928fe634ad915b421dc675c8982a28d71264da2380ed65cc3155c' 
  AND token = 'aBa9dG/kRaAjJ7Z9VBG3miKt125iY1bpJd0eavwbXm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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