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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdfb82fa1b4d98d5e044d767856d8fb7e25555a3cd0b9a25af3bf56cb353cb5' 
  AND token = 'bxAmCOYyF5qdfsn4p4aaoTQ9xQNnksUtlXJWdEE4RUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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