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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae80d1e70c55c992415efeeb29e10c6a0965edd2b6a6496c1cfa88fdcddfbf30' 
  AND token = 'BL5i53FkM0MqcJZTk+UJN4CFBetmqeIBo9qM5hkHc/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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