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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a24f5d1d75070cb9bb62abb83f3bf5403d396677621f1d2b12ea7170d4a5e1' 
  AND token = '8zw9sYptSMOYVClxWvMiXpWKEEX5JPLAVX8eyOca1zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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