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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d942811e11d0d9c7cd1183b6ca94b10555d5d1af28b13aa63a660e4c753bb00' 
  AND token = '/f5Y+YCBNNe7zEuYQv4B0L7AQchM8fT6NZJ4TP/psDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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