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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82fb5a9c4d9b1ebea6f39c58f77b08926e463415ad8d800048e2c08fa398781' 
  AND token = 'Mjovl1brDr664JRi48yUCjeftyRPHG1+66V7URkFyts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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