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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbbf8e4a33db3d7c8d3bc2d72d1b7eb0abf7bcaad22720c82357d0ad69b27f9a' 
  AND token = 'Rs4DSmfxXbC1/ZkqHHRGSFJkh0A/6auPShZBKDrVtAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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