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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600c822f0a3ed51e88fbd925671fbd993d4f06942dcf7e224c2b0b546084e15c' 
  AND token = 'rw4FnaX67j8xapzH45a7nPthau+VBTWAcjr/lgmTX3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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