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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27770f3fa1976830024a04a1c62be899d2c7d68ec6b6698f012a7c4bf79f897e' 
  AND token = '/hWYnBXYx9vf/0VvPc2UnGY1JFCg9MUtepHF1iXDq2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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