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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f153a9a8dd16b3d066e6e191a610085750ef5084dc5a82c81aa4e3f445989740' 
  AND token = '5GFtarq2gCtRAx41T11e9DPyETEWuAYueb3nZ6vHQbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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