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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef10e0fe526cf1b622a3ec329f480c8a81114a5f2b14dca4b001fa72218dcda' 
  AND token = 'qnnturejBrAi/LYLjqepxiT1c6EbRdDeW7zE8qoduCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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