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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a31adff2b9e0c45967faf30a80dd31dc67ccaab9c8a9bdb6c6fdc65092727d1' 
  AND token = 'nFyacH+IMbrwQ/HHP1UKjgEzQPMDfBYvy1W223xQvUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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