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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06c26b0b44643fb236950412bee3332b754905fa0747c4037749abe34073877' 
  AND token = 'JLciKIMcAIKaWCUcUMKV1JiPudQM3lF9+imtq+w+S5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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