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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2016820e96f0c5ce04c88c0042ecedd62b2127d4d3dd9377ba723147aeb39ab' 
  AND token = 'vcorOqKvhA3FSlX3VY/lmsAPtdd2ITJ090aEZptwbYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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