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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92182b5fdc46f4dfd08bc508eec73eeb702a9a40aaafdb3d1238cc0e84d17b1' 
  AND token = 'nulmCzTRsIJk4kyt3oWtZX+ZufhlKGRjWLO6WUk+l20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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