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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70d780da89b1cc11bcff9b96e055ccf6acc37c93763cdecdc4bd83a2e5a2cff' 
  AND token = 'whayDx4S34/FhYwhF7DvyVM5kgOdBi5eu2oexh6Vicc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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